CN106244875B - 7 line aluminium alloys of one kind and preparation method thereof - Google Patents

7 line aluminium alloys of one kind and preparation method thereof Download PDF

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CN106244875B
CN106244875B CN201610810550.9A CN201610810550A CN106244875B CN 106244875 B CN106244875 B CN 106244875B CN 201610810550 A CN201610810550 A CN 201610810550A CN 106244875 B CN106244875 B CN 106244875B
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casting
line aluminium
aluminium alloy
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aluminium alloys
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CN106244875A (en
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胡俊强
胡涛
李成龙
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Sichuan Fu Rong Technology Co Ltd
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Sichuan Fu Rong Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent

Abstract

The present invention relates to a kind of 7 line aluminium alloys, be grouped as by the group of following weight percentage: 1.32-1.40% magnesium, 0.014-0.016% titanium, 7.50-7.70% zinc, 0.003-0.005% manganese, the silicon not higher than 0.05%, the iron not higher than 0.08%, the copper not higher than 0.004%, the nickel not higher than 0.001%, the chromium not higher than 0.001% and the zirconium lower than 0.0003%, surplus are aluminium.The invention further relates to a kind of preparation methods of 7 line aluminium alloys.7 line aluminium alloys of the invention have the advantages that tensile strength, yield strength, elongation percentage and grain size number are excellent.

Description

7 line aluminium alloys of one kind and preparation method thereof
Technical field
The present invention relates to aluminium alloy technology, feature is related to 7 line aluminium alloys of one kind and preparation method thereof.
Background technique
Aluminium alloy is added alloying elements by fine aluminium and is made, and the Al-Mn that manganese element is developed is added such as in fine aluminium Alloy adds copper in fine aluminium and develops made of Al-Cu alloy, in fine aluminium while adding copper and magnesium elements develop Al-Cu- Mg system duralumin, hard alumin ium alloy, adding zinc, magnesium, copper develops Al-Zn-Mg-Cu 7 series extra super duralumin alloy etc. simultaneously in fine aluminium.Aluminium closes The feature of gold is light, intensity height, good heat dissipation, good hand touch and easy anode oxidation coloration.Under same intensity requirement, aluminium alloy Components can be made thinner and light than plastics, while being also able to satisfy the Highgrade integration of 3C Product, lightening, micromation, resisting Fall the requirement for hitting electromagnetic shielding and heat dissipation.The information technoloy equipments such as mobile phone, tablet computer, laptop on the market use now Aluminium alloy is commonly 6 line aluminium alloys, with the development of science and technology traditional 6 be that wrought aluminium alloy has been difficult to completely in terms of intensity The requirement of sufficient high-end product is especially bent in resistance to deformation, and in terms of the indexs such as anti-drop deformation, 6 be that wrought aluminium alloy and 7 systems deform The aluminium alloy gap that compares is larger.Consumer's idea constantly changes and starts to pursue 7 line aluminium alloys.7 line aluminium alloys possess 6 The characteristics of line aluminium alloy, and intensity is higher than 6 line aluminium alloys.
Although 7 line aluminium alloys are better than 6 line aluminium alloys in intensity, alloy part tensile strength and yield strength can reach 400Mpa or more, but tensile strength, yield strength reach 7 line aluminium alloys of 400Mpa or more, through anodic oxidation rear surface Quality is wrought aluminium alloy exquisiteness not as good as 6, and there are the surface defects such as striped, heterochromatic, beautiful decoration degree is low.And 7 systems deform aluminium The problems such as oxidation film that alloy anode aoxidizes stroke is unstable, is easy to appear stress corrosion, demoulding, therefore 7 line aluminium alloy applications It is less in the case study on implementation of decorative appearance material.
The China side patent of Patent No. 201510648237.5 discloses a kind of 7XXX aluminium alloy, the aluminium alloy The content (weight percent) of each ingredient are as follows: Zn content is 6.6%~7.6%, and content of magnesium is 1.25%~1.80%, copper content It is 0.18%~0.44%, silicone content≤0.06%, iron content≤0.16%, manganese content≤0.03%, chromium content≤0.03%, Gallium content≤0.02%, content of vanadium≤0.02%, Ti content≤0.03%, zirconium content≤0.02%, manganese add chromium summation≤ 0.03%;Single content≤0.03% of remaining impurity element, remaining impurity element summation≤0.10%, surplus is aluminium.
Although the 7XXX aluminium alloy of above-mentioned patent disclosure can make the oxygen that material obtains after anodic oxidation to a certain extent Change that film is more fine and smooth beautiful, but the 7XXX aluminium alloy of its acquisition is easy to appear there are still the oxidation film of anodic oxidation is unstable The problems such as stress corrosion, demoulding.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of the second best in quality 7 line aluminium alloy of anodic oxidation rear surface And preparation method thereof.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of 7 line aluminium alloys, are grouped as: 1.32-1.40% magnesium, 0.014-0.016% by the group of following weight percentage Titanium, 0.003-0.005% manganese, the silicon not higher than 0.05%, the iron not higher than 0.08%, is not higher than 7.50-7.70% zinc 0.004% copper, the nickel not higher than 0.001%, the chromium not higher than 0.001% and the zirconium lower than 0.0003%, surplus are aluminium.
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy, the temperature of the casting operation is greater than Or it is equal to 690 DEG C, the content that hydrogen is controlled during casting operation is no more than 0.15ml/100gAl;The guarantor of the homogenization practice Temperature is 494-498 DEG C, soaking time 540-600min.
The beneficial effects of the present invention are:
(1) under testing in continuous regulation experiment direction and constantly, the component proportion of 7 line aluminium alloys is redesigned, specifically , the content of zinc is improved to 7.50-7.70%, improves the content of magnesium to 1.32-1.40%, the content of titanium is reduced to 0.014- 0.016%, the content of manganese is reduced to 0.003-0.005%, by the matching design of the content specific gravity of above-mentioned magnesium, titanium, zinc and manganese, So that the stability of the oxidation film of the anodic oxidation of integral Al-alloy is effectively improved, showing for stress corrosion and demoulding is avoided As occurring;
(2) it is controlled by the content of above-mentioned silicon, iron, copper, nickel, chromium and zirconium, is especially being not higher than the content control of copper In the range of 0.004%, to further increase the stability of oxidation film;
(3) tensile strength of 7 line aluminium alloys of the invention is 410-460Mpa, yield strength 400-450MPa, is extended Rate is 10-15% and grain size number is 3-5 grades, has tensile strength, yield strength, elongation percentage and grain size number excellent Advantage.
(4) preparation method of 7 line aluminium alloys of the invention, casting accuracy can be improved in above-mentioned casting operation design, above-mentioned The uniformity coefficient of the matrix of 7 line aluminium alloys can be improved in homogenization practice, and then improves 7 line aluminium alloys prepared Quality;And the raising of the uniformity coefficient of the matrix of casting accuracy and aluminium alloy also contributes to improving the anodic oxygen of aluminium alloy The stability of the oxidation film of change;
(5) preparation method of 7 line aluminium alloys of the invention has the advantages that easy to operate, easy implementation, can effectively improve The production efficiency of 7 line aluminium alloys prepared.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, it is explained below in conjunction with embodiment.
The most critical design of the present invention is: the component proportion of 7 line aluminium alloys is redesigned, so that the sun of integral Al-alloy The stability of the oxidation film of pole oxidation is effectively improved.
The present invention provides a kind of 7 line aluminium alloys, is grouped as by the group of following weight percentage: 1.32-1.40% magnesium, 0.014-0.016% titanium, 7.50-7.70% zinc, 0.003-0.005% manganese, the silicon not higher than 0.05%, not higher than 0.08% Iron, the copper not higher than 0.004%, the nickel not higher than 0.001%, the chromium not higher than 0.001% and the zirconium lower than 0.0003%, it is remaining Amount is aluminium.
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy, the temperature of the casting operation is greater than Or it is equal to 690 DEG C, the content that hydrogen is controlled during casting operation is no more than 0.15ml/100gAl;The guarantor of the homogenization practice Temperature is 494-498 DEG C, soaking time 540-600min.
As can be seen from the above description, the beneficial effects of the present invention are:
(1) under testing in continuous regulation experiment direction and constantly, the component proportion of 7 line aluminium alloys is redesigned, specifically , the content of zinc is improved to 7.50-7.70%, improves the content of magnesium to 1.32-1.40%, the content of titanium is reduced to 0.014- 0.016%, the content of manganese is reduced to 0.003-0.005%, by the matching design of the content specific gravity of above-mentioned magnesium, titanium, zinc and manganese, So that the stability of the oxidation film of the anodic oxidation of integral Al-alloy is effectively improved, showing for stress corrosion and demoulding is avoided As occurring;
(2) it is controlled by the content of above-mentioned silicon, iron, copper, nickel, chromium and zirconium, is especially being not higher than the content control of copper In the range of 0.004%, to further increase the stability of oxidation film;
(3) tensile strength of 7 line aluminium alloys of the invention is 410-460Mpa, yield strength 400-450MPa, is extended Rate is 10-15% and grain size number is 3-5 grades, has tensile strength, yield strength, elongation percentage and grain size number excellent Advantage.
(4) preparation method of 7 line aluminium alloys of the invention, casting accuracy can be improved in above-mentioned casting operation design, above-mentioned The uniformity coefficient of the matrix of 7 line aluminium alloys can be improved in homogenization practice, and then improves 7 line aluminium alloys prepared Quality;And the raising of the uniformity coefficient of the matrix of casting accuracy and aluminium alloy also contributes to improving the anodic oxygen of aluminium alloy The stability of the oxidation film of change;
(5) preparation method of 7 line aluminium alloys of the invention has the advantages that easy to operate, easy implementation, can effectively improve The production efficiency of 7 line aluminium alloys prepared.
In 7 line aluminium alloys of the invention:
Further, the content of the titanium is 0.015%.
Seen from the above description, it can be further 0.015% by the content control of titanium, keep the crystal grain of 7 line aluminium alloys more equal It is even, and optimize the stability of oxidation film.
Further, the content of the manganese is 0.004%.
Seen from the above description, it can be further 0.004% by the content control of manganese, advanced optimize the stabilization of oxidation film Property.
Further, the content of the total impurities element of 7 line aluminium alloy is lower than 0.10%, the list of 7 line aluminium alloy The content of a impurity element is not higher than 0.05%.
Seen from the above description, the content for controlling impurity can make the crystal grain of 7 line aluminium alloys more evenly.
In the preparation method of 7 line aluminium alloys of the invention:
Further, the temperature of the casting operation is 695 ± 3 DEG C.
Further, the homogenization practice includes at least once air-cooled and water-cooled process at least once, the wind Cool time is 140-160min, and the water cooling time is 30-40min.
Further, the starting cast speed in the casting operation is 60-80mm/min, and speed when casting is 75- 105mm/min, water 170-230T/h, casting time are 90-120min.
Further, described to take off slag operation are as follows: the material after fusing is warming up to 715-725 DEG C, then using argon gas into Row refining, stands 15-20min, then removes the gred after refining.
Further, the temperature of the alloying operation is 720-740 DEG C, and material forms melt after alloying operates, It is first 735 ± 2 DEG C by the temperature control of the melt of acquisition, then carries out casting operation again.
The embodiment of the present invention one are as follows:
A kind of 7 line aluminium alloys, are grouped as by the group of following weight percentage: 1.32% magnesium, 0.014% titanium, 7.50% zinc, 0.003% manganese, 0.05% silicon, 0.08% iron, 0.004% copper, 0.001% nickel, 0.001% chromium and 0.00029% zirconium, surplus are aluminium.The content of the total impurities element of 7 line aluminium alloy is lower than 0.10%, and described 7 be that aluminium closes The content of the single impurity element of gold is not higher than 0.05%.
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy, the temperature of the casting operation is equal to 690 DEG C, the content that casting operation controls hydrogen in the process is 0.15ml/100gAl;The holding temperature of the homogenization practice is 494 DEG C, soaking time 540min.The homogenization practice includes at least once air-cooled and water-cooled process at least once, described The air-cooled time is 140 DEG C, and the water cooling time is 30 DEG C.Starting cast speed in the casting operation is 60mm/min, casting Speed when making is 75mm/min, and water 170T/h, the casting time is 120min.It is described to take off slag operation are as follows: after fusing Material is warming up to 715 DEG C, is then refined using argon gas, 15min is stood after refining, is then removed the gred.The alloying The temperature of operation is 720 DEG C, and material forms melt after alloying operates, and is first 735 DEG C by the temperature control of the melt of acquisition, Then casting operation is carried out again.
The embodiment of the present invention two are as follows:
A kind of 7 line aluminium alloys, are grouped as by the group of following weight percentage: 1.40% magnesium, 0.016% titanium, 7.70% zinc, 0.005% manganese, 0.03% silicon, 0.04% iron, 0.002% copper, 0.0005% nickel, 0.0005% chromium and 0.0001% zirconium, surplus are aluminium.The content of the total impurities element of 7 line aluminium alloy is lower than 0.10%, 7 line aluminium alloy Single impurity element content be not higher than 0.05%.
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy, the temperature of the casting operation is equal to 720 DEG C, the content that casting operation controls hydrogen in the process is 0.10ml/100gAl;The holding temperature of the homogenization practice is 498 DEG C, soaking time 600min.The homogenization practice includes at least once air-cooled and water-cooled process at least once, described The air-cooled time is 160 DEG C, and the water cooling time is 40 DEG C.Starting cast speed in the casting operation is 80mm/min, casting Speed when making is 105mm/min, and water 230T/h, the casting time is 90min.It is described to take off slag operation are as follows: after fusing Material is warming up to 725 DEG C, is then refined using argon gas, 20min is stood after refining, is then removed the gred.The alloying The temperature of operation is 740 DEG C, and material forms melt after alloying operates, and is first 737 DEG C by the temperature control of the melt of acquisition, Then casting operation is carried out again.
The embodiment of the present invention three are as follows:
A kind of 7 line aluminium alloys, are grouped as by the group of following weight percentage: 1.37% magnesium, 0.015% titanium, 7.60% zinc, 0.004% manganese, 0.01% silicon, 0.03% iron, 0.003% copper, 0.0008% nickel, 0.0008% chromium and 0.0002% zirconium, surplus are aluminium.The content of the total impurities element of 7 line aluminium alloy is lower than 0.10%, 7 line aluminium alloy Single impurity element content be not higher than 0.05%.
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy, the temperature of the casting operation is equal to 730 DEG C, the content that casting operation controls hydrogen in the process is 0.12ml/100gAl;The holding temperature of the homogenization practice is 496 DEG C, soaking time 560min.The homogenization practice includes at least once air-cooled and water-cooled process at least once, described The air-cooled time is 150 DEG C, and the water cooling time is 35 DEG C.Starting cast speed in the casting operation is 70mm/min, casting Speed when making is 100mm/min, and water 200T/h, the casting time is 100min.It is described to take off slag operation are as follows: after fusing Material is warming up to 720 DEG C, is then refined using argon gas, 17min is stood after refining, is then removed the gred.The alloying The temperature of operation is 730 DEG C, and material forms melt after alloying operates, and is first 736 DEG C by the temperature control of the melt of acquisition, Then casting operation is carried out again.
The embodiment of the present invention four are as follows:
A kind of preparation method of 7 line aluminium alloy is grouped as according to the group of 7 above-mentioned line aluminium alloys and successively carries out ingredient, melts Change, skim, alloying, casting, homogenization and sawing operation, obtaining 7 line aluminium alloy.
Raw material selection aspect, aluminum feedstock select high-purity remelting aluminium ingot, in high-purity remelting aluminium ingot, iron silicone content are as follows: Fe < 0.08;Si<0.05;Cu<0.004;Mn<0.004;Ni<0.001;Cr<0.001;Zr<0.0003;Special impurities content are as follows: single A < 0.01, amount to < 0.10.Magnesium raw material selects magnesium ingot, Mg content in magnesium ingot are as follows: magnesium >=99.90% (meets GB/T 3499- 2011);Zinc raw material selects zinc ingot metal, Zn content in zinc ingot metal are as follows: zinc >=99.99% (meets GB/T 470-2008);Aluminium simultaneously Titanium boron is as raw material, in aluminium titanium boron, specifications and models are as follows: Al-5Ti-1B (meets YS/T282-2000), and manufacturing firm can be with Are as follows: more than nova casting grade, KBM, KBA, LSM;Aluminium foundry returns is as raw material simultaneously, in aluminium foundry returns, quality requirement Are as follows: answer cleaning in surface: no dirt, without grease stain, no moisture, without surface-treated layer and it is other influence quality sundries, alloy designations It identifies clearly, without mixing;The standard instance of aluminium foundry returns are as follows: cutting head cutting tail in same alloy production process and release block, Casting rod waste material squeezes cutting head cutting tail, deep processing waste material, disapproves in aluminium foundry returns and aluminium skimmings, aluminium ash reclaimed materials, 3000 systems etc. are added High manganese waste material, 4000 be contour scrap silicon and other iron content, gallium, vanadium food ingredient waste material.
It in alloying operation, successively carries out plus waste material and high-purity aluminium ingot, Zincification ingot and skims, skim, it is molten to material After change, temperature reaches 720 DEG C, stands 15 minutes after being refined for the first time with argon gas, then removes the gred;After skimming, melt temperature is controlled It carries out adding magnesium ingot under conditions of 720 DEG C (being not higher than 730 DEG C), be opened electromagnetic agitation 30 minutes after adding magnesium ingot;Then it is sampled, It to be sampled at 1/2 of melt depth at the left, center, right of smelting furnace burner hearth 1/3 when sampling, totally 3.Feed supplement is carried out after sampling, That is: magnesium or silicon are added, feed supplement of the additive amount lower than 100Kg can be added in chute;If other feed supplements will be put greater than 100Kg's It is added at fire door, feed supplement temperature is controlled according to 740 DEG C, and stirring after feed supplement 20 minutes can sub-sampling again.Then heat preservation is checked Furnace and converter, are toasted in advance specifically, emptying molten aluminum and residue, holding furnace in holding furnace before converter, converter feed supplement simultaneously.It connects down Carry out furnace refining processing, the time is 25 minutes, then leads to argon gas and carries out second and refines, and refining cannot thoroughly will stay dead Angle, refining pipe will reach melt bottom.It after refining, is stirred, is then allowed to stand, time of repose is controlled at 20~30 points Clock.Then carry out casting preceding sampling, when sampling will sample at 1/2 of melt depth at the left, center, right of holding furnace burner hearth 1/3, altogether 3.If unqualified to finely tune need to re-start from step 9.Melt temperature controls 735 DEG C before opening casting, and error is no more than 2 DEG C.
It in casting operation, first carries out casting preceding preparation, preparation includes: the preparation of convective tank before casting: degasification leading portion uses bone Powder protection, degasification back segment are protected using boron nitride, and degasification back segment chute application dust catcher was cleared up, noresidue, free from flaw, are kept It is dry;Insulation furnace outlet places glass fiber filter bag;Preparation to depassing unit: vacuum state is normal, temperature is normal, rotor work Make within 150 hours service life;Preparation to casting disk: casting disk should preheat, and clear up using dust catcher, noresidue, free from flaw, Nothing falls off and has uniformly sprayed boron nitride;Casting each crystallizer of disk should detect qualification in advance, between pinboard and graphite crystallization ring Groove should be mended with graphite in advance;Preparation to titanium boron wire drawing-in device: checking whether wire feeder is normal, opens and answers in the preceding chute of casting 5 circle titanium boron wires are put in advance;Preparation to plate-type filtering: Rose Box should be preheating to using temperature, should be cleaned out in cabinet, filter plate It should be without short circuit;Preparation to tubular filter: it is cast if it is the first furnace, to toast Rose Box and screen pipe in advance, not be first Furnace casting tubular filter will be kept the temperature, and rely guncotton to block up head piece employment;Preparation to each weif orifice: each weif orifice should block peace Entirely, casting machine has been placed around enough emergency and has plugged, stifled pricker and fiber cotton plate, spare releases case;Preparation to casting machine: casting Platform contraposition is made, cooling water is opened;And prepare to set technological parameter, the specific design of the technological parameter is referring to table 1.Table 1 For the technological parameter list of casting operation.
Table 1
Specification mm Casting speed mm/min Water T/h Load time s Starting velocity mm/min
178 105 220-230 17 84
254 75 170-190 18 60
It is cast after preparing before casting, manufacturing platform hot-side temperature must not be lower than 690 DEG C in entire casting process, control At 695 ± 3 DEG C;And control degasification, it may be assumed that using the SIR equipment worked normally, hydrogen content is controlled and is no more than in maximum 0.15ml/100g Al.Holding furnace must not open stirring in casting process, must not Human disturbance chute, distribution plate liquid flowing shape State, cannot fish out slag, and a pair of of melt is controlled.
Casting round-off work is carried out after above-mentioned casting, controls remaining molten aluminum, it may be assumed that release Rose Box, chute molten aluminum And mark is carried out, molten aluminum is then released if not production same alloy is continued in furnace.
In homogenization practice, preparation is first carried out, that is, by long ingot soaking, soaking after first sawing uses material rack special It charges;Check that soaking pit burner, fire door, natural gas are normal.Check that soaking trolley travelling is normal;Confirm equal hot material frame without broken Damage, soaking aluminium pad is without tilting.Confirm that platform center is expected in pendulum in equal hot material frame center.Then the casting of targeted design different size Ingot pendulum material quantity, uniform heating process and cooling technique.Ingot casting pendulum material quantity, uniform heating process and the cooling technique of different size are referring to table 2.Table 2 is ingot casting pendulum material quantity, uniform heating process and the cooling technique list of different size.
Table 2
Then discharging is extremely after every furnace ingot casting soaking hot-zone and cold-zone take ingot casting label " verifying/cold heat " printed words Soaking zone stamps soaking lot number with letter punch every ingot casting end, then prints and paste ingot casting two dimensional code.Finished product ingot casting End should be marked with alloy designations, the two-dimension code label of " homogeneous ", red symbol pen label.
In sawing operation, firstly, preparing before carrying out sawing, it is ensured that sawing machine equipment operates normally, and it is fixed to adjust billet for sawing Ruler is, it is specified that scale ± 6mm (short ingot ± 3mm);Steel seal number is adjusted according to billet heat for sawing and the trade mark;And cutting head is set and is greater than 400mm, back-end crop are greater than 250mm.
Then it tests, examines the checked operation including Surface Quality and scale, it may be assumed that surface requirements: surface (including End face and circumference) it should clean, is smooth, forbid to polish to any end face and circumferential surface, surface defect caused by no casting and operation are drawn The scar risen, no iron mold, burr, scratch, burn into greasy dirt, dust and other foreign substances;Aluminium bar length direction maximum deflection Degree/amount of deflection should be less than 1.5mm/m;Sawing end face squareness: 90.0 ° +/- 0.5 °;Answer cleaning in surface: without dirt, without grease stain, nothing Moisture, the sundries without surface-treated layer and other influence quality, alloy designations mark is clear, scale meets regulation.Inspection is also wrapped Include the checked operation to inherent quality, it may be assumed that low power: isometric, uniform fine grained texture, and lacked without Feather-like Crystal, crackle, stomata etc. It falls into.Segregation layer will reach the requirement of client;The sawing length at aluminium ingot both ends it is ensured that cracking of the aluminium bar without inside and out or its It is harmful to the defect of aluminium bar quality, and without it is loose, crack, be mingled with (oxide, boride etc.) and other foreign substances.Inspection Testing further includes checked operation to coupongs, it may be assumed that batch produce alloy 2 slices must be taken respectively from cold end on casting platform and Two ingot castings in hot end, and be intended to be taken from the lower end of ingot casting, and close to the position for amputating end.For the 4 of first batch of sample Piece slice should be taken respectively from two ingot castings of cold and hot end on casting platform, and the upper and lower end of ingot casting is intended to sample, and to connect It is bordering on the position for amputating end.Inspection further includes the checked operation that sample presentation does high power, it may be assumed that drills through high power print and laboratory is sent to do gold Phase is examined and determine crystal grain and is mingled with.
Then it is identified, mark will clearly (having certain width of nick), in the station location marker for slightly deviateing aluminium bar center. Font height should should easily be removed not less than 6.0mm. label, cannot there are glue or remaining marks on aluminium bar when removing label Label.And label should be attached on strapping, cannot be placed directly against on aluminium bar.
It is finally stored, neat safety is put in guarantee, and 7 line aluminium alloys prepared are in billet, and billet is not hanging, no More than 10 layers.
Measure of merit
1, tensile strength, yield strength, elongation percentage and the grain size number for 7 line aluminium alloys for obtaining embodiment one to four It is tested respectively.Specific test method may be selected in the prior art to the tensile strength of aluminium alloy, yield strength, elongation percentage With the common testing methods of grain size number.
The result shows that the tensile strength for 7 line aluminium alloys that embodiment one to four obtains is 410-460Mpa, yield strength is 400-450MPa, elongation percentage is 10-15% and grain size number is 3 grades -5 grades.
2,7 line aluminium alloys that embodiment one to four obtains are subjected to coloring respectively and dyeing property is tested.Specifically, by real The test that 7 line aluminium alloys for applying the acquisition of example one to four carry out the coloring of conventional color respectively and dyeing is handled, specific coloring and dye The conventional method of coloring and dyeing processing in the prior art can be used in the operation of the test of color processing.
The result shows that this 7 line aluminium alloy is easy colouring, and coloring and dyeing effect are good, wherein conventional color such as gold Color, light red, champagne, rose golden and silver gray etc..
3,7 line aluminium alloys that embodiment one to four obtains are subjected to anodic oxidation effect test respectively.
Specifically, being placed in the electrolyte such as sulfuric acid using the product of 7 line aluminium alloys as anode, applies anode voltage and carry out Electrolysis forms layer oxide film on the surface of 7 line aluminium alloys, then with the thickness for surveying the oxidation film that the measurement of film instrument is formed.
The result shows that thickness up to 60~200 μm, has good hardness and wearability.Also, the oxidation film fusing point Up to 5320K has good heat resistance;Its breakdown voltage resistant up to 3000V, has excellent insulating properties;In ω=0.03 NaCl salt fog in do not corroded through 10000 hours, corrosion resistance can be significantly increased.
In addition, there is a large amount of micropore in the oxidation film thin layer, adsorbable various lubricants, suitable for manufacture wear-resisting zero Part;The strong pigmentable of the membrane micropore adsorption capacity color gorgeous at various beauties.
Therefore, 7 line aluminium alloys of the invention do not occur stress corrosion and stripping phenomenon after anodic oxidation, have sun The good advantage of pole oxidation effectiveness.
In conclusion 7 line aluminium alloy provided by the invention can effectively improve the oxidation of the anodic oxidation of integral Al-alloy The stability of film, the phenomenon that avoiding stress corrosion and demoulding generation, and there is tensile strength, yield strength, elongation percentage and crystalline substance The excellent advantage of grain size category.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalents made by bright description are applied directly or indirectly in relevant technical field, are similarly included in this hair In bright scope of patent protection.

Claims (8)

1. a kind of 7 line aluminium alloys, which is characterized in that be grouped as by the group of following weight percentage: 1.32-1.40% magnesium, 0.015% titanium, 7.50-7.70% zinc, 0.004% manganese, the silicon not higher than 0.05%, the iron not higher than 0.08%, 0.002- 0.004% copper, the nickel of 0.0005-0.001%, the chromium of 0.0005-0.001% and 0.0001-0.00029% zirconium, surplus For aluminium.
2. 7 line aluminium alloy according to claim 1, which is characterized in that the content of the total impurities element of 7 line aluminium alloy Lower than 0.10%, the content of the single impurity element of 7 line aluminium alloy is not higher than 0.05%.
3. a kind of preparation method of 7 line aluminium alloys, is grouped according to the group of 7 line aluminium alloys described in claim 1-2 any one At successively carrying out ingredient, melt, skim, alloying, casting, homogenization and sawing operation, 7 line aluminium alloy is obtained, it is special Sign is that the temperature of the casting operation is greater than or equal to 690 DEG C, and the content that hydrogen is controlled during casting operation is no more than 0.15ml/100gAl;The holding temperature of the homogenization practice is 494-498 DEG C, soaking time 540-600min.
4. the preparation method of 7 line aluminium alloy according to claim 3, which is characterized in that the temperature of the casting operation is 695±3℃。
5. the preparation method of 7 line aluminium alloy according to claim 3, which is characterized in that the homogenization practice includes extremely Few primary air-cooled and water-cooled process at least once, the air-cooled time is 140-160 DEG C, and the water cooling time is 30- 40min。
6. the preparation method of 7 line aluminium alloy according to claim 3, which is characterized in that the starting in the casting operation Casting speed is 60-80mm/min, and speed when casting is 75-105mm/min, water 170-230T/h, and the casting time is 90-120min。
7. the preparation method of 7 line aluminium alloy according to claim 3, which is characterized in that described to take off slag operation are as follows: will melt Material afterwards is warming up to 715-725 DEG C, is then refined using argon gas, 15-20min is stood after refining, is then removed the gred.
8. the preparation method of 7 line aluminium alloy according to claim 3, which is characterized in that the temperature of the alloying operation It is 720-740 DEG C, material forms melt after alloying operates, and is first 735 ± 2 DEG C by the temperature control of the melt of acquisition, so Carry out casting operation again afterwards.
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CN105220040A (en) * 2015-11-19 2016-01-06 广东和胜工业铝材股份有限公司 A kind of Al-Zn-Mg alloy and preparation method thereof and application
CN105671384A (en) * 2016-01-07 2016-06-15 瑞声光电科技(常州)有限公司 Aluminum alloy and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN105220040A (en) * 2015-11-19 2016-01-06 广东和胜工业铝材股份有限公司 A kind of Al-Zn-Mg alloy and preparation method thereof and application
CN105671384A (en) * 2016-01-07 2016-06-15 瑞声光电科技(常州)有限公司 Aluminum alloy and preparation method thereof

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